Finding the Fourth Proportional to 1,780.38, 2,457.02 and 994.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.38 : 2,457.02 = 994.42 : x
2. Step 2: Convert to fraction form
   1,780.38/2,457.02 = 994.42/x
3. Step 3: Cross multiply
   1,780.38x = 2,457.02 × 994.42
4. Step 4: Simplify right side
   1,780.38x = 2,443,309.83
5. Step 5: Solve for x
   x = 2,443,309.83/1,780.38
6. Step 6: Final answer
   x = 1,372.35